I've seen the part about the Glomar Explorer before, but I still find it interesting whenever I see it. Amazing they managed to keep it a secret for as long as they did.
Project Jennifer - Hughes Glomar Explorer (AG 193)
http://www.globalsecurity.org/intell/systems/jennifer.htm
The Hughes Glomar Explorer's Mission
http://w3.the-kgb.com/dante/military/mission.html